public static Bitmap LaplaceGreyscale(Bitmap b)
{
ImagerBitmap i = new ImagerBitmap(b.Clone() as Bitmap);
ImagerBitmap i2 = new ImagerBitmap(b.Clone() as Bitmap);
for (int column = 1; column < i.Bitmap.Width - 1; column++)
{
for (int row = 1; row < i.Bitmap.Height - 1; row++)
{
int[,] c = i.GetGrey3x3(row, column);
int val = (((c[0, 0] + c[0, 1] + c[0, 2] + c[1, 0] + c[1, 2] + c[2, 0] + c[2, 1]
+ c[2, 2]) * -1) + (c[1, 1] * 8)) + 128;
if (val >= 128) val = 0; else val = 255;
i2.SetPixel(column, row, Color.FromArgb(val, val, val));
}
}
i.UnlockBitmap();
i2.UnlockBitmap();
return i2.Bitmap.Clone() as Bitmap;
}